package com.meng;

import java.io.*; 

public class MyEclipseGen { 
     private static final String LL = "Decompiling this copyrighted software is a violation of both your license agreement and the Digital Millenium Copyright Act of 1998 (http://www.loc.gov/copyright/legislation/dmca.pdf). Under section 1204 of the DMCA, penalties range up to a $500,000 fine or up to five years imprisonment for a first offense. Think about it; pay for a license, avoid prosecution, and feel better about yourself."; 
     public String getSerial(String userId, String licenseNum) { 
         java.util.Calendar cal = java.util.Calendar.getInstance(); 
         cal.add(1, 3); 
         cal.add(6, -1); 
         java.text.NumberFormat nf = new java.text.DecimalFormat("000"); 
         licenseNum = nf.format(Integer.valueOf(licenseNum)); 
         String verTime = new StringBuilder("-").append(new java.text. 
                 SimpleDateFormat("yyMMdd").format(cal.getTime())).append("0"). 
                          toString(); 
         String type = "YE3MP-"; 
         String need = new StringBuilder(userId.substring(0, 1)).append(type). 
                       append("300").append(licenseNum).append(verTime).toString(); 
         String dx = new StringBuilder(need).append(LL).append(userId).toString(); 
         int suf = this.decode(dx); 
         String code = new StringBuilder(need).append(String.valueOf(suf)). 
                       toString(); 
         return this.change(code); 
     } 
  
     private int decode(String s) { 
         int i; 
         char[] ac; 
         int j; 
         int k; 
         i = 0; 
         ac = s.toCharArray(); 
         j = 0; 
         k = ac.length; 
         while (j < k) { 
             i = (31 * i) + ac[j]; 
             j++; 
         } 
         return Math.abs(i); 
     } 
  
     private String change(String s) { 
         byte[] abyte0; 
         char[] ac; 
         int i; 
         int k; 
         int j; 
         abyte0 = s.getBytes(); 
         ac = new char[s.length()]; 
         i = 0; 
         k = abyte0.length; 
         while (i < k) { 
             j = abyte0[i]; 
             if ((j >= 48) && (j <= 57)) { 
                 j = (((j - 48) + 5) % 10) + 48; 
             } else if ((j >= 65) && (j <= 90)) { 
                 j = (((j - 65) + 13) % 26) + 65; 
             } else if ((j >= 97) && (j <= 122)) { 
                 j = (((j - 97) + 13) % 26) + 97; 
             } 
             ac[i] = (char) j; 
             i++; 
         } 
         return String.valueOf(ac); 
     } 
  
     public MyEclipseGen() { 
         super(); 
     } 
  
     public static void main(String[] args) { 
         try { 
             System.out.println("please input register name:"); 
             BufferedReader reader = new BufferedReader(new InputStreamReader( 
                     System.in)); 
             String userId = null; 
             userId = reader.readLine(); 
             MyEclipseGen myeclipsegen = new MyEclipseGen(); 
             String res = myeclipsegen.getSerial(userId, "20"); 
             System.out.println("Serial:" + res); 
             reader.readLine(); 
         } catch (IOException ex) { 
         } 
     } 
}
